Abstract
ε-AlxFe2-xO3 (x = 0, 0.125, 0.167, 0.222 and 0.4) nanoparticles were manufactured by a new kind of mesoporous template-compacted fumed silica. The effect of Al3+ composition on the purity and magnetic performances of the ε-AlxFe2-xO3 samples were investigated. The structural and magnetic performances of the samples were characterized by X-ray diffraction, transmission electron microscope and SQUID magnetometer. The results indicate that the doping of Al3+ can decrease the dimension of ε-Fe2O3 nanoparticles and effectively reduce the formation of α-Fe2O3 impurity in the samples. And the magnetic phase transition temperature of the ε-AlxFe2-xO3 samples decreases with the increase of Al3+. And the low temperature magnetic phase transition finally vanishes at x = 0.222. The ε-AlxFe2-xO3 samples exhibit large coercivity. With the increase of Al3+ content, the coercivity of ε-AlxFe2-xO3 increases firstly to a maximum and then decreases.
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